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"A galaxy core battery has a 1,800mah capacity and it..."

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The 12 hours rule of first time battery charging only applies to old phones. We usually hear it with our sellers. A galaxy core battery has a 1,800mAh capacity and it has a modern type of battery that does need this first time charging rule.

Galaxy core battery can last for about 12 hrs when use in 3G talk, 7 hrs in web browsing, and 7.5 hrs in video playback. What is important is you use only appropriate or prescribe charger for your device. This is to maintain and preserve you battery`s good performance for a long time. But you can also condition your battery by practicing this rule which is to charge it until it`s full and then use the phone until it`s fully discharged. Practicing this make your battery lasts longer than usual. This also make your battery indicators more accurate.

"Need to charge your samsung galaxy s3`s battery until it shows that is is..."

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You only need to charge your Samsung Galaxy S3`s battery until it shows that is is fully charged. You do not need to charge ir for 12 hours or what you call initial charging.
Batteries of mobile phones nowadays are already pre-charged. So, you don`t need to pre-charge it anymore. After several charge and discharge, your battery will achieve its optimum capacity.

"Run a few cycles to get the battery settled in..."

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With new phones, I always let it drain to 10%-15% and do a full charge and let it run a few cycles to get the battery settled in. I don`t think there`s a right or wrong answer to this, but I`ve been doing this with my new phones since I switched over to smartphones and have had decent to great battery life.

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